First UL 3700-compliant plug-in solar microinverter now available in the US
Hoymiles has launched the HiFlow Pro microinverter, the first to meet the new US safety standard, allowing solar panels to be plugged into a standard wall outlet.
Last week, Hoymiles released its HiFlow Pro microinverter, which is the first in the US to comply with the recently adopted national safety standard UL 3700. This device enables solar power to be drawn through a typical household outlet. While microinverters are not a new product category, this one is notable for conforming to UL 3700, adopted in December 2025 as the inaugural North American safety standard for plug-in photovoltaic energy systems, sometimes called "balcony solar."
A major issue with adopting small-scale solar panels is the risk that, because the converters draw electricity into a socket rather than out of it, power could backfeed into the grid during outages, endangering repair crews. UL 3700 standardizes features to prevent accidental overloads and other safety concerns. Plug-in solar isn't powerful enough to run an entire apartment, but it reduces reliance on the electric grid without requiring a full array of panels. Having a federal standard for these smaller setups expands the potential consumer base for solar to renters and apartment dwellers who cannot pursue full rooftop installations.
